<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        ul li{float: right ;width: 50px;}
    </style>
</head>
<body>
<ul>
    <li>登录</li>
    <li>注册</li>
    <li>登出</li>
</ul>
</body>
</html>